/**
 * Copyright (c) 2016, Gluon
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *     * Neither the name of Gluon, any associated website, nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL GLUON BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.gluonhq.samples.connect.rest;

import com.gluonhq.connect.converter.InputStreamIterableInputConverter;
import com.gluonhq.connect.converter.JsonConverter;

import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonObject;
import javax.json.JsonReader;
import java.util.Iterator;

public class ItemsIterableInputConverter<E> extends InputStreamIterableInputConverter<E> implements Iterator<E> {

    private JsonArray jsonArray;
    private int index;
    private final JsonConverter<E> converter;

    public ItemsIterableInputConverter(Class<E> targetClass) {
        converter = new JsonConverter<>(targetClass);
    }

    @Override
    public boolean hasNext() {
        return index < jsonArray.size();
    }

    @Override
    public E next() {
        JsonObject jsonObject = jsonArray.getJsonObject(index++);
        return converter.readFromJson(jsonObject);
    }

    @Override
    public Iterator<E> iterator() {
        index = 0;

        try (JsonReader reader = Json.createReader(getInputStream())) {
            JsonObject jsonObject = reader.readObject();
            jsonArray = jsonObject.getJsonArray("items");
        }

        return this;
    }
}
